Artificial tooth



H. STURM Oct. 20, 1925- ARTIFICIAL TOOTH Filed Feb. 11, 1925 m m N o mNa ,lH

. ATTORNEY Patented Get. 2119, 1925..

" UNITED stares:

PATEN? Fries.

HANS. STURM, OF REICHENBERG, CZECHOSLOVAKIA.

ARTIFICIAL 'roorn.

Application filed February 11,1925. Serial No. 8,319.

in an artificial tooth having a metallic back-' plate, as described inthe German Patent 216,271. The improvement according to th1s inventionconsists essentially in the fact that the anchor for the tooth is madeas a resilient loop, for instance of oval or polygonal shape, by meansof which it may be resiliently introduced into a similarly formed.recess in the tooth. I

In order to avoid breaking the porcelain tooth while introducing theresilient anchor, according to this invention a certain reduction in thespring power of the loop may be brought about. This, for instance, maybe attained by making the loop as a separate part from a very thin metalstrip and soldering the same to the metallic back-plate. A furtherreduction in spring power may be obtained by having the loop weakened orcut open longitudinally at certain places.

According to the form of the loop as mentioned, in the tooth itselfthere is provided a recess, the walls of which will be in contact withthe anchor after being introduced. In order to prevent recoil of theloop due to its resiliency and in orderto completely hold the anchor inposition, the hollow space surrounded by the loop before beingintroduced into the tooth, according to this invention may be filled upwith cement.

The loop, in case of a so-called pivot tooth, may also be fixedrelatively tothe base of the tooth and the interior walls of the recessby introducing a pin of proper cross-section through said base againstthe interior walls of the loop after being inserted into said recess. Acement filling for the hollow space of the loop may be used in additionto this.

The resilient anchor according to this invention is made in anespeciallysimple and expeditious manner by forming a V-shaped metal plate whichmay be integral with the metallic back-plate of the tooth or unitedtherewith after being formed, placing said plate between a supportingmandrel or core of the desired form and a pair of tongs of like form,and giving the final shape to said plate by compressing the opening ofthe tongs.

In the drawing a tooth according to this invention is shown, as well asthe new proc-. ess of making the anchor for said tooth.

:Fig. 1 is across-section of a toothronstruct ed inaccordance-with thisinvention showingthe same before attachment of the back plate, Fig. 2v alongitudinal section taken centrally through Fig. 1, Figs. 3, 4 and 5illustrate the loop in different stages of its development, Fig. 6 is across-section of a tooth in completed condition, Figs/7 and 8 illustratemodified forms of the loop, Fig.

9 is alongitudinal section through a completed pivot-tooth, Figs. 10 and11 show a further modification of the mode of fixing the looped anchorupon the backplate, and Fig. 12 is a fragmentary side view of a pair pftongs suitable for the formation of the In Figs. 1 and 2 an artificialtooth a is shown which is provided with a polygonal recess 7) for thereception of an anchor. In order to form the anchor itself, a metalsheet 0 .made for instance from gold, is bent into the cross-sectionalform shown in Fig. 3. This plate is then fastened separately upon asupporting sheet of metal by means the V-shaped portion of the loop andthe y latter is pressed upon this core by means of a pair of tongshaving a properly formed opening, so that the loop will finally'have theshape of the anchor 6 shown in Fig. 5. This anchor-is resilient inlateral direction and may therefore be readily introduced into theopening of recess 2) of the tooth a. Fig. 6 shows the anchor after beingunited with the tooth. The hollow space surrounded by the anchor beforebeing introduced into the tooth is provided with a cement filling and inthis manner a wedge will be formed, which will nullify the resiliency ofthe anchor and prevent the same from coming outof the recess of thetooth.

In Figs. 7 and 8 two ways are shown for purposely reducing the springpower of the anchor, in order to avoid destruction of the Y tooth, whenintroducing the anchor.

' weakened as shown at h and in Fig. 8 said wall is slit as shown at i.

Fig. 9 shows an example of a pivottooth in longitudinal cross-section,which tooth is provided with an anchor in the form of a loop in themanner above indicated. In this case the loop, in addition to this, isfastened by means of a pin it to the metallic back-plate d which isintegral with the pin j, said pin 70 being inserted from below throughthe under part of the plate d against the wall of the loop.

According to Figs. 10 and 11 a rectangular opening 1 is cut out in theback-plate 03, said opening serving for the introduction of a loop suchas that shown in Fig. 8 in the manner shown in Fig. 11, the flaps m ofthe loop being soldered to the rear of plate d. The loop, moreover isformed and united with the tooth in the manner above described.

Having thus described my said invention,

I declare that what I claim is The combination with an artificial toothhaving a recess, of a back plate, a polygonal loop adapted to receivecement and connected to the back plate, said loop fitting within therecess and interlocked with the tooth, and a vertical pin extendingthrough the back plate andfitting within the loop at the front thereofand additionally fastening the loop to the back plate.

, In testimony whereof I affiX my signature.

DR. HANS STURM.

